timed relay

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dragonracing

Member - Posts: 1

Joined: May 01, 2003

Posted: May 01, 2003 at 2:25 PM / IP Logged

I need to power something for 2 seconds after the power is cut. I need to know what size capacitor and resitor to use. And where could i get a capacitor that size

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Thinkster

Copper - Posts: 94

Joined: March 27, 2002

Location: United States

Posted: May 02, 2003 at 3:55 AM / IP Logged

Generaly in RC circuits, Time=(R*C). Usually capacitors are in uF (so in calculating, use Exponent -6) and resistors are usally in K (to the Exponent 3) So in my calculations, a 100uF cap and a 20K resistor should be about 2 seconds. You can probably get caps & resistors at a local electronic store or possibly Rat Shack. For online ordering, try DigiKey or Mouser.

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timed relay

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